A Composite Rest-Frame UV Spectrum of Galaxies at $5.7<z<6.9$: Ionization, Outflows, and Implications for Intergalactic Metal Enrichment
We present a stacked JWST/NIRSpec spectrum of 104 galaxies at $\lambda_{\rm rest}=1200\unicode{x2013}2000\;\mathrm{\mathring{A}}$ to study nebular emission and absorption from the interstellar medium (ISM) and stellar winds. The sample is drawn from known [O III] emitters with mean redshift $z=6.50$, absolute UV magnit...